MMP-12 knockdown prevents secondary brain damage after ischemic stroke in mice.

MMP-12 knockdown prevents secondary brain damage after ischemic stroke in mice.
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DOI:
10.1016/j.neuint.2022.105432
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发表时间:
2022-12
影响因子:
4.2
通讯作者:
Vemuganti, Raghu
Vemuganti, Raghu
中科院分区:
医学3区
文献类型:
--
作者:
Arruri, Vijay;Chokkalla, Anil K.;Jeong, Soomin;Chelluboina, Bharath;Mehta, Suresh L.;Veeravalli, Krishna Kumar;Vemuganti, Raghu

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我们以前报道过,在大鼠局灶性脑缺血后,基质金属蛋白酶-12(MMP-12)的表达增加通过紧密连接蛋白降解介导血脑屏障破坏。目前,我们评估了MMP-12敲低是否能保护中风后小鼠的大脑并促进更好的功能恢复。成年雄性小鼠在短暂大脑中动脉闭塞1小时后再灌注5分钟时注射阴性siRNA或MMP-12 siRNA(静脉内)。MMP-12敲低显著减少缺血后梗死体积,改善运动和认知功能恢复。机制上,MMP-12敲低改善了局灶性缺血后紧密连接蛋白封闭小带-1,claudin-5和occludin的降解。MMP-12基因敲除还降低了缺血后炎症介质的表达,包括单核细胞趋化蛋白-1、肿瘤坏死因子-α和白细胞介素-6,以及凋亡标记物裂解的caspase-3的表达。总之,本研究表明MMP-12促进卒中后继发性脑损伤,因此是一个有前途的卒中治疗靶点。
We previously reported that increased expression of matrix metalloproteinase-12 (MMP-12) mediates blood-brain barrier disruption via tight junction protein degradation after focal cerebral ischemia in rats. Currently, we evaluated whether MMP-12 knockdown protects the post-stroke mouse brain and promotes better functional recovery. Adult male mice were injected with negative siRNA or MMP-12 siRNA (intravenous) at 5 min of reperfusion following 1h transient middle cerebral artery occlusion. MMP-12 knockdown significantly reduced the post-ischemic infarct volume and improved motor and cognitive functional recovery. Mechanistically, MMP-12 knockdown ameliorated degradation of tight junction proteins zonula occludens-1, claudin-5, and occludin after focal ischemia. MMP-12 knockdown also decreased the expression of inflammatory mediators, including monocyte chemoattractant protein-1, tumor necrosis factor-α, and interleukin-6, and the expression of apoptosis marker cleaved caspase-3 after ischemia. Overall, the present study indicates that MMP-12 promotes secondary brain damage after stroke and hence is a promising stroke therapeutic target.
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